Automatic control device for drilling fluid pulse signal pressure and control method thereof

Abstract

The application relates to the technical field of while-drilling measurement and control instruments, and discloses a drilling fluid pulse signal pressure automatic control device and a control method thereof. The former comprises a body, a detection driving assembly, a fixing sleeve, a throttling sleeve, a throttling head, a direct-acting rod and a power assembly. The inner side of the body is provided with the throttling sleeve, the left side of the throttling sleeve is fixedly provided with the fixing sleeve, the left outer side of the body is provided with a mounting ring groove, and the detection driving assembly is arranged in the mounting ring groove. The detection driving assembly can drive the fixing sleeve to move and can detect the drilling fluid pulse pressure data on the inner side of the throttling sleeve. The throttling head is in the shape of a Chinese character 'er'. The application has the advantages of reasonable and compact structure and convenient use. The detection driving assembly is arranged to push the fixing sleeve and the throttling sleeve to move leftward and rightward, the gap between the throttling sleeve and the throttling head is changed, the drilling fluid pulse pressure signal strength is increased or reduced, the drilling fluid signal strength is ensured to be constant, and the drilling fluid signal strength is not affected by the wellbore environment interference, the erosion reduction throttling pressure condition and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling control instruments, and is an automatic control device for drilling fluid pulse signal pressure and a control method thereof. BACKGROUND

[0002] As the main way of data uploading of the current drilling control instrument, the drilling fluid pulse signal transmission mode is the only means for the ground engineer to communicate with the downhole and monitor the drilling conditions in the drilling process. The strength of the drilling fluid pulse signal determines the error rate of the decoded data on the ground to a large extent. The drilling fluid pulser used by the current drilling control instrument is determined by the fixed installation size on the ground, and the downhole pressure signal strength cannot be adjusted. With the increase of drilling depth and time, the weakening of the drilling fluid signal leads to the situation that the ground cannot decode. No signal has become the main problem of the current drilling control instrument. The main reasons are as follows: first, in the process of drilling deep wells and ultra-deep wells, the compressibility of the drilling fluid, the invasion of fluid and bubbles in the wellbore, etc. will affect the pressure signal strength of the drilling fluid, so that the pressure signal uploaded to the ground is weakened and the ground cannot decode; second, in the drilling process, the drill bit, drill string vibration and impact with the well wall will produce interference signals, a large number of interference signals and normal drilling fluid pressure signals produced by the instrument are mixed together, and when the pressure signal strength is basically the same, the ground cannot decode; third, with the increase of well depth, due to the compressibility of the drilling fluid, the drilling fluid signal itself attenuates in the transmission process, and the pressure signal strength is too weak to be normally decoded on the ground; fourth, due to the erosion of the drilling fluid, the pressure signal produced by the drilling fluid signal generating device of the instrument itself is too weak to be decoded on the ground. The above situations usually occur in multiple couplings. At present, the main means of the field engineer is to adjust the throttle gap of the drilling fluid pulse device on the ground to ensure the strength of the drilling fluid signal for a long time. However, due to the increase of the throttle pressure and the increase of the ground pump pressure caused by the adjustment of the throttle gap, under the condition of the ground pump pressure, the drilling fluid discharge can only be reduced, which brings great risk to the safety of rock carrying and safe drilling. With the exploration and development of deep and ultra-deep wells, the demand for stable and reliable instruments for safe drilling is urgent. SUMMARY

[0003] The present application provides an automatic control device for drilling fluid pulse signal pressure and a control method thereof, which overcomes the shortcomings of the prior art and effectively solves the problem of weakening of the existing drilling fluid signal leading to the inability of the ground to decode.

[0004] One of the technical solutions of the present application is realized by the following measures: a drilling fluid pulse signal pressure automatic control device, comprising a body, a detection driving assembly, a fixing sleeve, a throttling sleeve, a throttling head, a straight rod and a power assembly, the inside of the body is provided with the throttling sleeve, the left side of the throttling sleeve is fixedly provided with the fixing sleeve, the left side of the body is provided with a mounting ring groove, the detection driving assembly is arranged in the mounting ring groove, the detection driving assembly can drive the fixing sleeve to move and detect the drilling fluid pulse pressure data on the inside of the throttling sleeve, the throttling head is in the shape of a Chinese character, the left part of the throttling head is located inside the throttling sleeve, the right end of the throttling head is fixedly provided with the straight rod on the inside, the right part of the straight rod is provided with the power assembly, and the power assembly can drive the straight rod to move left and right within a fixed stroke.

[0005] The following is a further optimization or / and improvement of the above-mentioned technical solutions of the application:

[0006] The above-mentioned detection driving assembly can comprise a pump, a driving motor, a battery pack, a downhole control circuit, a pressure acquisition circuit and a pressure sensor connected together from left to right, a cover plate capable of closing the mounting ring groove is mounted on the body, the mounting ring groove is filled with hydraulic oil, the pressure sensor acquisition end is in communication with the inside of the throttling sleeve, the right end of the fixing sleeve is provided with a first outer ring groove, a split sleeve is sleeved on the outside of the middle part of the fixing sleeve, the first outer ring groove is divided into a left cavity and a right cavity, the inside of the body corresponding to the left side and the right side of the split sleeve is provided with a check ring, and the output end of the pump is connected with the first outer ring groove.

[0007] The above-mentioned can comprise two groups of detection driving assemblies, a split sleeve is sleeved on the outside of the middle part of the fixing sleeve, the inside of the body corresponding to the left side and the right side of the split sleeve is provided with a check ring, the output end of the pump of the first group of detection driving assemblies is in communication with the left cavity, the throttling sleeve can be controlled to move to the left, and the output end of the pump of the second group of detection driving assemblies is in communication with the right cavity, the throttling sleeve can be controlled to move to the right.

[0008] The inside of the lower end of the above-mentioned fixing sleeve can be provided with an inner ring groove, the upper end of the throttling sleeve is located in the inner ring groove, and the left side of the throttling sleeve is fixedly provided with the fixing sleeve through bolts.

[0009] The above-mentioned power assembly can comprise an outer cylinder and a generator, the right end of the straight rod is provided with a second outer ring groove, the outer cylinder is sleeved on the second outer ring groove, the right end of the outer cylinder is located to the right of the straight rod, the inside of the outer cylinder is sequentially provided with a rotating disc, a speed reducer, a signal motor, a driving circuit and a power supply circuit from left to right and connected together, the left side of the rotating disc and the right side of the straight rod are inclined surfaces capable of cooperating with each other, two inclined surfaces are provided with semicircular ball grooves with opposite openings, the ball grooves are provided with rolling balls, the right end of the outer cylinder is connected with a connecting joint, the right end of the connecting joint is connected with a wire plug joint, and the right end of the wire plug joint is connected with the generator.

[0010] The power assembly can further include a flow guide, the flow guide is arranged outside the connecting joint and the wire-through plug joint, and a plurality of spiral blades are arranged outside the flow guide.

[0011] Two sealing rings can be arranged between the left and right spaces between the body and the cover plate, a sealing ring is arranged between the fixed sleeve and the body, a sealing ring is arranged between the inner side of the fixed sleeve and the split sleeve, a sealing ring is arranged between the outer side of the split sleeve and the body, a sealing ring is arranged between the fixed sleeve and the throttle sleeve, two sealing rings are arranged between the left and right spaces between the throttle sleeve and the body, four sealing rings are arranged between the left and right spaces between the direct-acting rod and the outer cylinder, and two sealing rings are arranged between the left and right spaces between the speed reducer and the outer cylinder.

[0012] A stop ring can be arranged in the body corresponding to the left position of the fixed sleeve.

[0013] The second technical solution of the present application is realized by the following measures: a control method is performed according to the following method, first, the ground writes a pressure control target value into the downhole control circuit according to the setting, after the instrument is lowered into the well, when the drilling fluid flows, the rotating wheel of the driving generator rotates to generate an electric current, after processing by the power supply circuit, the driving circuit and the signal motor are supplied with power for use, the driving circuit controls the signal motor to rotate, drives the speed reducer and the rotating disc to rotate, pushes the direct-acting shaft and the throttle head to move left and right, changes the gap between the throttle head and the throttle sleeve, generates a downhole drilling fluid pulse signal, the pressure sensor monitors the drilling fluid pulse pressure data in real time, when the drilling fluid pulse pressure data is consistent with the preset value, the driving motor and the pump do not work, when the downhole control circuit monitors that the drilling fluid pulse pressure data is lower than the preset pressure value, the driving motor and the pump of the second detection driving assembly are controlled to work, the fixed sleeve is pushed to move to the right, the gap between the throttle sleeve and the throttle head is reduced, and the drilling fluid pressure pulse signal strength is increased; when the downhole control circuit monitors that the drilling fluid pulse signal pressure value is higher than the preset value, the driving motor and the pump of the first detection driving assembly work, the fixed sleeve is pushed to move to the left, the gap between the throttle head and the throttle sleeve is increased, and the drilling fluid pulse pressure signal strength is reduced.

[0014] The present application has reasonable and compact structure, and is convenient to use, the detection driving assembly pushes the fixed sleeve and the throttle sleeve to move left and right, changes the gap between the throttle sleeve and the throttle head, and thus increases or reduces the drilling fluid pulse pressure signal strength, ensures that the drilling fluid signal strength is constant, and is not affected by the wellbore environment interference, erosion and reduction of throttle pressure. BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is a schematic structural diagram of a left part of an embodiment of the present application. Figure 1

[0016] FIG. 2 is a schematic structural diagram of a right part of an embodiment of the present application. Figure 2

[0017] ​​The codes in the attached diagram are as follows: 1 for the main body, 2 for the cover plate, 3 for the pump, 4 for the drive motor, 5 for the battery pack, 6 for the downhole control circuit, 7 for the pressure acquisition and processing circuit, 8 for the retaining ring, 9 for the bolt, 10 for the fixing sleeve, 11 for the pressure sensor, 12 for the throttling sleeve, 13 for the throttling head, 14 for the direct-acting rod, 15 for the outer cylinder, 16 for the ball bearing, 17 for the rotary disc, 18 for the generator, 19 for the reducer, 20 for the signal motor, 21 for the sealing ring, 22 for the drive circuit, 23 for the power supply circuit, 24 for the adapter, 25 for the flow guide, 26 for the wire plug connector, and 27 for the dividing sleeve. Detailed Implementation

[0018] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0019] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0020] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0021] Example 1: As shown in the attached document Figure 1 , 2 As shown, the drilling fluid pulse signal pressure automatic control device includes a main body 1, a detection and drive assembly, a fixed sleeve 10, a throttling sleeve 12, a throttling head 13, a direct-acting rod 14, and a power assembly. The throttling sleeve 12 is provided inside the main body 1, and the fixed sleeve 10 is fixedly installed on the left side of the throttling sleeve 12. An installation annular groove is provided on the outer left side of the main body 1, and the detection and drive assembly is provided in the installation annular groove. The detection and drive assembly can drive the fixed sleeve 10 to move and can detect the drilling fluid pulse pressure data inside the throttling sleeve 12. The throttling head 13 is shaped like a "Z". The left side of the throttling head 13 is located inside the throttling sleeve 12. The direct-acting rod 14 is fixedly installed on the inner right side of the throttling head 13. The power assembly is provided on the right side of the direct-acting rod 14. The power assembly can push the direct-acting rod 14 to move left and right within a fixed stroke.

[0022] In use, although the power assembly can push the direct-acting rod 14 to move the throttle head 13 left and right, the pulse pressure signal of the drilling fluid is weakened due to various factors, which leads to the situation that the ground cannot be decoded, so the detection driving assembly is arranged to drive the fixed sleeve 10 and the throttle sleeve 12 to move left and right, thereby narrowing the gap between the throttle sleeve 12 and the throttle head 13 on the basis of the power assembly, enhancing the pulse pressure signal of the drilling fluid, and greatly improving the anti-interference ability of the drilling fluid pulse signal of the while-drilling measurement and control instrument, greatly reducing the error rate of the while-drilling measurement and control instrument in deep well and super deep well data uploading reliability, and increasing the gap between the throttle sleeve 12 and the throttle head 13, which is helpful to delay the erosion damage of the erosion part and improve the erosion-resistant long-life working ability, which can greatly reduce the forced drilling caused by instrument signal failure. The present application considers the problem of many impurities and high solid content in the drilling fluid, and designs an upper and lower direct-acting structure with a large flow channel, which can ensure more stable signal generation ability, higher adaptability to large particle passage and large displacement circulation in the downhole environment, and greatly improve the downhole working life and adaptability.

[0023] The drilling fluid pulse signal pressure automatic control device can be further optimized or / and improved according to actual needs:

[0024] Embodiment 2: as shown in the accompanying Figure 1 The detection driving assembly includes a pump 3, a driving motor 4, a battery pack 5, a downhole control circuit 6, a pressure acquisition circuit and a pressure sensor 11 connected together from left to right, a cover plate 2 capable of closing the installation ring groove is installed on the body 1, the installation ring groove is filled with hydraulic oil, the acquisition end of the pressure sensor 11 is in communication with the inner side of the throttle sleeve 12, the right end of the fixed sleeve 10 is provided with a first outer ring groove, a split sleeve 27 is sleeved on the outer side of the middle part of the fixed sleeve 10, which divides the first outer ring groove into a left cavity and a right cavity, the inner side of the body 1 corresponding to the left and right positions of the split sleeve 27 is provided with a check ring 8, and the output end of the pump 3 is connected with the first outer ring groove.

[0025] The downhole control circuit 6 supplies power to the pressure acquisition processing circuit 7 by processing the power obtained by the battery pack 5, processes the pressure data obtained from the pressure acquisition circuit, and controls the circuit rotation according to the target pressure value, the pressure sensor 11 acquisition circuit processes the original pressure signal acquired by the pressure sensor 11, and sends the data to the downhole control circuit 6 for calculation and use through the wire.

[0026] Embodiment 3: as shown in the accompanying Figure 1As shown, two sets of detection driving assemblies are arranged, a split sleeve 27 is arranged on the outer side of the middle part of the fixed sleeve 10, which divides the first outer ring groove into a left cavity and a right cavity, the inner side of the body 1 corresponding to the left and right positions of the split sleeve 27 is provided with a check ring 8, the output end of the pump 3 of the first set of detection driving assemblies is in communication with the left cavity, which can control the left movement of the throttle sleeve 12, the output end of the pump 3 of the second set of detection driving assemblies is in communication with the right cavity, which can control the right movement of the throttle sleeve 12.

[0027] By arranging two sets of detection driving assemblies to control the different moving directions of the throttle sleeve 12, the control is simple.

[0028] Embodiment 4: as shown in the accompanying Figure 1 As shown, the inner side of the lower end of the fixed sleeve 10 is provided with an inner ring groove, the outer side of the upper end of the throttle sleeve 12 is located in the inner ring groove, and the left side of the throttle sleeve 12 is fixedly installed with the fixed sleeve 10 through the bolt 9.

[0029] In use, such arrangement enhances the sealing performance.

[0030] Embodiment 5: as shown in the accompanying Figure 2 As shown, the power assembly includes an outer cylinder 15 and a generator 18, the right end of the straight rod 14 is provided with a second outer ring groove, the outer cylinder 15 is arranged on the second outer ring groove, the right end of the outer cylinder 15 is located to the right of the straight rod 14, the inner side of the outer cylinder 15 is sequentially provided with a rotating disc 17, a speed reducer, a signal motor 20, a driving circuit 22 and a power supply circuit 23 from left to right and connected together, the left side of the rotating disc 17 and the right side of the straight rod 14 are inclined surfaces capable of cooperating with each other, the two inclined surfaces are provided with semicircular ball grooves with opposite openings, the ball grooves are provided with the ball 16, the outer cylinder 15 is connected with a connecting joint, the right end of the connecting joint is connected with a wire plug joint 26, and the right end of the wire plug joint 26 is connected with the generator 18.

[0031] The generator 18 supplies power to the power supply circuit 23, the signal motor 20 drives the speed reducer and the rotating disc 17 to rotate, the rotating disc 17 pushes the straight rod 14 and the throttle head 13 to move left and right, and a pulse signal is formed.

[0032] Embodiment 6: as shown in the accompanying Figure 2 As shown, the power assembly further includes a flow guide 25, the outer side of the connecting joint and the wire plug joint 26 is provided with the flow guide 25, and the outer side of the flow guide 25 is provided with a plurality of spiral blades.

[0033] The flow guide 25 restricts the flow direction of the fluid, better pushes the rotating wheel on the generator 18 to rotate, and ensures stable power generation.

[0034] Embodiment 7: as shown in the accompanying Figure 1 , 2 ​As shown, two sealing rings 21 are arranged between the body 1 and the cover plate 2, a sealing ring 21 is arranged between the fixed sleeve 10 and the body 1, a sealing ring 21 is arranged between the fixed sleeve 10 and the inner side of the split sleeve 27, a sealing ring 21 is arranged between the outer side of the split sleeve 27 and the body 1, a sealing ring 21 is arranged between the fixed sleeve 10 and the throttle sleeve 12, two sealing rings 21 are arranged between the throttle sleeve 12 and the body 1, four sealing rings 21 are arranged between the straight rod 14 and the outer cylinder 15, and two sealing rings 21 are arranged between the speed reducer and the outer cylinder 15.

[0035] The sealing ring 21 is arranged to seal the fluid, so as to avoid the fluid from moving and causing the movement failure.

[0036] Embodiment 8: as shown in the accompanying drawings, Figure 1 As shown, the body 1 at the left position of the fixed sleeve 10 is provided with a stop ring 8.

[0037] The stop ring 8 is arranged to limit the moving distance of the fixed sleeve 10 to the left.

[0038] Embodiment 9: as shown in the accompanying drawings, Figure 1 2 As shown, the following method is used: first, the ground writes the pressure control target value in the downhole control circuit 6, after the instrument is put into the well, when the drilling fluid flows, the rotating wheel of the driving generator 18 rotates to generate current, after the power supply circuit 23 processes, the current is supplied to the driving circuit 22 and the signal motor 20 for use, the driving circuit 22 controls the signal motor 20 to rotate, drives the speed reducer 19 and the rotating disc 17 to rotate, and drives the straight rod and the throttle head 13 to move left and right, changes the gap between the throttle head 13 and the throttle sleeve 12, generates the downhole drilling fluid pulse signal, and the pressure sensor 11 monitors the drilling fluid pulse pressure data in real time, when the drilling fluid pulse pressure data is consistent with the preset value, the driving generator 4 and the pump 3 do not work, when the downhole control circuit 6 monitors that the drilling fluid pulse pressure data is lower than the preset pressure value, the driving generator 4 and the pump 3 of the second detection driving assembly are controlled to work, the fixed sleeve 10 is pushed to move to the right, the gap between the throttle sleeve 12 and the throttle head 13 is reduced, and the drilling fluid pressure pulse signal strength is increased; when the downhole control circuit 6 monitors that the drilling fluid pulse signal pressure value is higher than the preset value, the driving generator 4 and the pump 3 of the first detection driving assembly work, the fixed sleeve 10 is pushed to move to the left, the gap between the throttle head 13 and the throttle sleeve 12 is increased, and the drilling fluid pulse pressure signal strength is reduced.

[0039] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.​

Claims

1. A drilling fluid pulse signal pressure automatic control device, characterized in that The utility model provides a kind of well drilling fluid pulse pressure data detection device, including body, detection drive assembly, fixed sleeve, throttle sleeve, throttle head, straight rod and power component, the inside of body is equipped with throttle sleeve, throttle sleeve left side is fixedly installed with fixed sleeve, the outside of body left part is equipped with installation ring groove, detection drive assembly is equipped in installation ring groove, detection drive assembly can drive fixed sleeve to move and can detect the drilling fluid pulse pressure data of the inside of throttle sleeve, throttle head is in the shape of several characters, throttle head left part is located inside throttle sleeve, straight rod is fixedly installed with the inside of throttle head right end, power component is equipped in straight rod right part, power component can promote straight rod to move left and right in fixed stroke; Detection drive assembly includes pump, driving motor, battery pack, downhole control circuit, pressure acquisition circuit and pressure sensor connected together in sequence from left to right, the cover plate that can close installation ring groove is installed on the body, installation ring groove is filled with hydraulic oil, the inside of throttle sleeve is communicated with the acquisition end of pressure sensor, the outside of fixed sleeve right end is equipped with first outer ring groove, and the output end of pump is connected with the first outer ring groove; It includes two groups of detection drive assembly, the outside of fixed sleeve middle part is equipped with split sleeve, which divides the first outer ring groove into left cavity and right cavity, the inside of body is equipped with retaining ring corresponding to the position of split sleeve left side and right side, the output end of the pump of the first group of detection drive assembly is communicated with the left cavity, which can control throttle sleeve to move left, and the output end of the pump of the second group of detection drive assembly is communicated with the right cavity, which can control throttle sleeve to move right.

2. The automatic drilling fluid pulse signal pressure control apparatus of claim 1, wherein The inside of fixed sleeve lower end is equipped with inner ring groove, the outside of throttle sleeve upper end is located in the inner ring groove, and the left side of throttle sleeve is fixedly installed with fixed sleeve through bolt.

3. The automatic drilling fluid pulse signal pressure control apparatus of claim 1 or 2, wherein Power component includes outer cylinder and generator, the outside of straight rod right end is equipped with second outer ring groove, the outer cylinder is sleeved on the second outer ring groove, the right end of outer cylinder is located to the right of straight rod, the outer cylinder is sequentially equipped with rotating disc, speed reducer, signal motor, driving circuit and power supply circuit from left to right, the left side of rotating disc is inclined to the right side of straight rod, two inclines are equipped with semicircular ball grooves with opposite openings, ball grooves are equipped with ball bearings, the right end of connecting connector is connected with wire plug connector, and the right end of wire plug connector is connected with generator.

4. The apparatus of claim 3, wherein Power component further includes flow guide, and flow guide is arranged on the outside of connecting connector and wire plug connector.

5. The apparatus of claim 3, wherein Two sealing rings are arranged between body and cover plate, sealing ring is arranged between fixed sleeve and body, sealing ring is arranged between the inside of fixed sleeve and split sleeve, sealing ring is arranged between the outside of split sleeve and body, sealing ring is arranged between fixed sleeve and throttle sleeve, two sealing rings are arranged between throttle sleeve and body, four sealing rings are arranged between straight rod and outer cylinder, two sealing rings are arranged between speed reducer and outer cylinder, or / and, retaining ring is arranged in the body corresponding to the left side of fixed sleeve.

6. The apparatus of claim 4, wherein Two sealing rings are arranged between the left and right spaces between the body and the cover plate, a sealing ring is arranged between the fixed sleeve and the body, a sealing ring is arranged between the inner side of the fixed sleeve and the split sleeve, a sealing ring is arranged between the outer side of the split sleeve and the body, a sealing ring is arranged between the fixed sleeve and the throttle sleeve, two sealing rings are arranged between the left and right spaces between the throttle sleeve and the body, four sealing rings are arranged between the straight rod and the outer cylinder, two sealing rings are arranged between the reducer and the outer cylinder, or / and, a stop ring is arranged in the body corresponding to the left position of the fixed sleeve.

7. A control method for the automatic control device for drilling fluid pulse signal pressure according to any one of claims 3 to 6, characterized by The method is as follows: first, the ground writes the pressure control target value into the downhole control circuit according to the setting, after the instrument is put into the well, when the drilling fluid flows, the rotating wheel of the driving generator rotates to generate current, after the power supply circuit processes, the current is supplied to the driving circuit and the signal motor for work, the driving circuit controls the signal motor to rotate, drives the reducer and the rotating disc to rotate, pushes the straight rod and the throttle head to move left and right, changes the gap between the throttle head and the throttle sleeve, generates the downhole drilling fluid pulse signal, the pressure sensor monitors the drilling fluid pulse pressure data in real time, when the drilling fluid pulse pressure data is consistent with the preset value, the driving motor and the pump do not work, when the downhole control circuit monitors that the drilling fluid pulse pressure data is lower than the preset pressure value, the driving motor and the pump of the second detection driving assembly work, push the fixed sleeve to move to the right, reduce the gap between the throttle sleeve and the throttle head, and increase the drilling fluid pressure pulse signal strength; when the downhole control circuit monitors that the drilling fluid pulse signal pressure value is higher than the preset value, the driving motor and the pump of the first detection driving assembly work, push the fixed sleeve to move to the left, increase the gap between the throttle head and the throttle sleeve, and reduce the drilling fluid pulse pressure signal strength.

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